My Windstar is leaking transmission fluid between the oil pan and the transmission pan. Doesn't look to be from the drive boot. Any ideas of what it could be?My Windstar is leaking transmission fluid between the oil pan and the transmission pan. Doesn't look to be from the drive boot. Any ideas of what it could be?

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it is easy to tell the difference between water and oil
if it is water ,it can be hose , radiator, water pump seal or the like
if it is oil ( red oil ) is the transmission oil cooler lines , or black oil crank shaft seals or oil filter leaks
check the coolant level , take it to an accredited radiator shop and confirm if oil or water

Are you sure its no leaking anywhere external ?? I would have it pressure tested sooner than later because if it is leaking internal inside the engine or transmission cooler it could be causing a lot more damage the longer its left unrepaired, I have seen a few of the early C class Radiators leak coolant into the transmission oil through the cooler in the radiator resulting in major damage to the transmission if not caught early, especially if your vehicle is fitted with a Valeo radiator.- you can check for the Valeo name marked on the radiator and get it tested A.S.A.P

A couple of leaks can be fairly large. An Oil Pan leak where you will see oil seeping down the sides of the pan and dripping directly below. The other is a Rear Main Bearing Seal leak and the oil will be coming from where the engine meets the transmission.

Normally if oil or transmission fluid mixes with coolant it will turn
milky looking like a milkshake. Your leak must be pretty fresh. from
your description that it is coming out of the coolant overflow I am
thinking you have a radiator transmission cooler leaking into the
cooling system.

You will need a new radiator and possibly all the coolant hoses if they have become soft from the transmission fluid.

In most cases if your getting transmission fluid in the radiator it is
cause by a bad transmission cooler that is built into the radiator and
the fix is to replace the radiator.

The repair will change in price from where the leak is coming from. If
the pan is leaking or the rear seal your looking at $100.00 or less. If
the front seal is leaking then around $550.00. The most common leak is
the pan gasket. Also if the transmission fluid and filter have not been
replaced in the last 30,000 miles and the pan is leaking then I suggest
doing this also why the pan is off .

Hope this helps; also keep in mind that your feedback
is important and
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testimonial comment about this answer.

you oil pan bolts of the bottom of the oil resivour the gaskit fits in between the surfaces where the pan meets it creating a seal witch in your case needs to be replaced this procedure replaces that gaskit to create a new seal

This could be caused by multiple components failing. what i have seen most often on the windstar is the transmission pan gasket leaking, which is maybe a twenty dollar gasket between the pan and transmission, very simple to do, just requires removing between 10 and 20 bolts and replacing the gasket, then refilling the trans. i have also seen lines leaking going to the transmission cooler, which are more expensive and much more involved than the pan.

torque specs for these bolts can be found in a Haynes or Chilton manual availiable from your local parts store, or maybe at your local library, however these bolts are usually no more than 14 ft pounds, unlike cylinder head bolts, the bolts do not need to have any stretch factor to hold the oil pan gasket in place or sealed.